boost/python/converter/builtin_converters.hpp
// Copyright David Abrahams 2002. // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #ifndef BUILTIN_CONVERTERS_DWA2002124_HPP # define BUILTIN_CONVERTERS_DWA2002124_HPP # include <boost/python/detail/prefix.hpp> # include <boost/python/detail/none.hpp> # include <boost/python/handle.hpp> # include <boost/python/ssize_t.hpp> # include <boost/implicit_cast.hpp> # include <string> # include <complex> # include <boost/limits.hpp> // Since all we can use to decide how to convert an object to_python // is its C++ type, there can be only one such converter for each // type. Therefore, for built-in conversions we can bypass registry // lookups using explicit specializations of arg_to_python and // result_to_python. namespace boost { namespace python { namespace converter { template <class T> struct arg_to_python; BOOST_PYTHON_DECL PyObject* do_return_to_python(char); BOOST_PYTHON_DECL PyObject* do_return_to_python(char const*); BOOST_PYTHON_DECL PyObject* do_return_to_python(PyObject*); BOOST_PYTHON_DECL PyObject* do_arg_to_python(PyObject*); } // Provide specializations of to_python_value template <class T> struct to_python_value; namespace detail { // Since there's no registry lookup, always report the existence of // a converter. struct builtin_to_python { // This information helps make_getter() decide whether to try to // return an internal reference or not. I don't like it much, // but it will have to serve for now. BOOST_STATIC_CONSTANT(bool, uses_registry = false); }; } // Use expr to create the PyObject corresponding to x # define BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(T, expr, pytype)\ template <> struct to_python_value<T&> \ : detail::builtin_to_python \ { \ inline PyObject* operator()(T const& x) const \ { \ return (expr); \ } \ inline PyTypeObject const* get_pytype() const \ { \ return (pytype); \ } \ }; \ template <> struct to_python_value<T const&> \ : detail::builtin_to_python \ { \ inline PyObject* operator()(T const& x) const \ { \ return (expr); \ } \ inline PyTypeObject const* get_pytype() const \ { \ return (pytype); \ } \ }; # define BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE(T, expr) \ namespace converter \ { \ template <> struct arg_to_python< T > \ : handle<> \ { \ arg_to_python(T const& x) \ : python::handle<>(expr) {} \ }; \ } // Specialize argument and return value converters for T using expr # define BOOST_PYTHON_TO_PYTHON_BY_VALUE(T, expr, pytype) \ BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(T,expr, pytype) \ BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE(T,expr) // Specialize converters for signed and unsigned T to Python Int #if PY_VERSION_HEX >= 0x03000000 # define BOOST_PYTHON_TO_INT(T) \ BOOST_PYTHON_TO_PYTHON_BY_VALUE(signed T, ::PyLong_FromLong(x), &PyLong_Type) \ BOOST_PYTHON_TO_PYTHON_BY_VALUE(unsigned T, ::PyLong_FromUnsignedLong(x), &PyLong_Type) #else # define BOOST_PYTHON_TO_INT(T) \ BOOST_PYTHON_TO_PYTHON_BY_VALUE(signed T, ::PyInt_FromLong(x), &PyInt_Type) \ BOOST_PYTHON_TO_PYTHON_BY_VALUE( \ unsigned T \ , static_cast<unsigned long>(x) > static_cast<unsigned long>( \ (std::numeric_limits<long>::max)()) \ ? ::PyLong_FromUnsignedLong(x) \ : ::PyInt_FromLong(x), &PyInt_Type) #endif // Bool is not signed. #if PY_VERSION_HEX >= 0x02030000 BOOST_PYTHON_TO_PYTHON_BY_VALUE(bool, ::PyBool_FromLong(x), &PyBool_Type) #else BOOST_PYTHON_TO_PYTHON_BY_VALUE(bool, ::PyInt_FromLong(x), &PyInt_Type) #endif // note: handles signed char and unsigned char, but not char (see below) BOOST_PYTHON_TO_INT(char) BOOST_PYTHON_TO_INT(short) BOOST_PYTHON_TO_INT(int) BOOST_PYTHON_TO_INT(long) // using Python's macro instead of Boost's - we don't seem to get the // config right all the time. # ifdef HAVE_LONG_LONG BOOST_PYTHON_TO_PYTHON_BY_VALUE(signed BOOST_PYTHON_LONG_LONG, ::PyLong_FromLongLong(x), &PyLong_Type) BOOST_PYTHON_TO_PYTHON_BY_VALUE(unsigned BOOST_PYTHON_LONG_LONG, ::PyLong_FromUnsignedLongLong(x), &PyLong_Type) # endif # undef BOOST_TO_PYTHON_INT #if PY_VERSION_HEX >= 0x03000000 BOOST_PYTHON_TO_PYTHON_BY_VALUE(char, converter::do_return_to_python(x), &PyUnicode_Type) BOOST_PYTHON_TO_PYTHON_BY_VALUE(char const*, converter::do_return_to_python(x), &PyUnicode_Type) BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::string, ::PyUnicode_FromStringAndSize(x.data(),implicit_cast<ssize_t>(x.size())), &PyUnicode_Type) #else BOOST_PYTHON_TO_PYTHON_BY_VALUE(char, converter::do_return_to_python(x), &PyString_Type) BOOST_PYTHON_TO_PYTHON_BY_VALUE(char const*, converter::do_return_to_python(x), &PyString_Type) BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::string, ::PyString_FromStringAndSize(x.data(),implicit_cast<ssize_t>(x.size())), &PyString_Type) #endif #if defined(Py_USING_UNICODE) && !defined(BOOST_NO_STD_WSTRING) BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::wstring, ::PyUnicode_FromWideChar(x.data(),implicit_cast<ssize_t>(x.size())), &PyUnicode_Type) # endif BOOST_PYTHON_TO_PYTHON_BY_VALUE(float, ::PyFloat_FromDouble(x), &PyFloat_Type) BOOST_PYTHON_TO_PYTHON_BY_VALUE(double, ::PyFloat_FromDouble(x), &PyFloat_Type) BOOST_PYTHON_TO_PYTHON_BY_VALUE(long double, ::PyFloat_FromDouble(x), &PyFloat_Type) BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(PyObject*, converter::do_return_to_python(x), 0) BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::complex<float>, ::PyComplex_FromDoubles(x.real(), x.imag()), &PyComplex_Type) BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::complex<double>, ::PyComplex_FromDoubles(x.real(), x.imag()), &PyComplex_Type) BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::complex<long double>, ::PyComplex_FromDoubles(x.real(), x.imag()), &PyComplex_Type) # undef BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE # undef BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE # undef BOOST_PYTHON_TO_PYTHON_BY_VALUE # undef BOOST_PYTHON_TO_INT namespace converter { void initialize_builtin_converters(); } }} // namespace boost::python::converter #endif // BUILTIN_CONVERTERS_DWA2002124_HPP